Ip Polling Of Serial Remotes; Serial Remotes With Two Serial Ports - GE MDS SD Series Reference Manual
Secure, long range ip/ethernet & serial
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IP Polling of Serial Remotes
The transceiver is ideal for use in systems employing a mix of serial and
Ethernet protocols. While many variations are possible, Figure 7 shows
a typical scenario with an Ethernet host at the Master Unit that is polling
serial-based RTUs at the Remote sites.
In this example, the Host Computer is connected directly to the radio's
Ethernet port, and the RTUs at the Remote sites are connected to the
transceiver via the radio's
serial data ports. (
may also be
COM2
COM1
used for payload data if properly configured via the menu system. See
next application example.)
Invisible place holder
Ethernet Data Port Menu
MASTER RADIO
(TCP Client)
To Ethernet Port
HOST COMPUTER
MODBUS RTU
(TCP Server)
Protocol
REMOTE RADIO
REMOTE RADIO
(One of several possible sites)
(One of several possible sites)
To COM2
To COM2
Serial Port
Serial Port
MODBUS® SERIAL RTU
MODBUS® SERIAL RTU
Figure 7. IP Polling of Serial Remotes
Serial Remotes with Two Serial Ports
In some cases, it may be necessary to poll more than one RTU at a
Remote site. Figure 8 shows an example of this type of system. Here,
two RTUs are connected to each Remote transceiver, by using both of
the radio's serial ports—
and
.
COM1
COM2
By default, the radio's
port is configured for management func-
COM1
tions with a connected PC, but it may be configured for data service
using the COM1 Port Settings Menu. (
Main Menu>>Serial Configura-
) This arrangement allows two telemetry net-
tion>>COM1 Port Settings
works to share a single radio system.
10
SD Series Ref. Manual (Packet & Transparent Mode)
MDS 05-4846A01, Rev. C
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